New Engine Clatter that rises with revs
Thread Starter
Former Vendor
Joined: Oct 2014
Posts: 73
Likes: 0
From: Hudson OH
This may sound out of left field but it happened to me. I had pulled over and heard a loud rattle coming from the bottom end of my car. The death rattle. It increased w/revs but all vital signs were good (oil pressure, vacuum, oil color, coolant color). I had the car flatbedded to my tech expecting the worse.
I got a call from my tech a few hours later hoping for the best but expecting the worst. It was...
...a bad catalytic converter. Whew. It was very hard to discern where the noise was coming from being the cat is right in front of the oil pan. Even my tech who is a seasoned 996 specialist had to drill a hole in the cat and stick a rod inside to put pressure on the element (the rattle then stopped) to confirm it was indeed the cat and not a lower end rod bearing or similar.
Here's to hoping it's a simple, cheap remedy....
I got a call from my tech a few hours later hoping for the best but expecting the worst. It was...
...a bad catalytic converter. Whew. It was very hard to discern where the noise was coming from being the cat is right in front of the oil pan. Even my tech who is a seasoned 996 specialist had to drill a hole in the cat and stick a rod inside to put pressure on the element (the rattle then stopped) to confirm it was indeed the cat and not a lower end rod bearing or similar.
Here's to hoping it's a simple, cheap remedy....
Thread Starter
Former Vendor
Joined: Oct 2014
Posts: 73
Likes: 0
From: Hudson OH
On my way to a meeting. Did not notice rattle until exiting freeway. Nowhere to easily stop. All other factors looked healthy. No vibration. No smoke. Good gauge reading. Running well. So I completed the last mile or two of the journey and flat-bedded it out of the car park at the office. To be honest it did not sound or feel fatal at the time.
Thread Starter
Former Vendor
Joined: Oct 2014
Posts: 73
Likes: 0
From: Hudson OH
This may sound out of left field but it happened to me. I had pulled over and heard a loud rattle coming from the bottom end of my car. The death rattle. It increased w/revs but all vital signs were good (oil pressure, vacuum, oil color, coolant color). I had the car flatbedded to my tech expecting the worse.
I got a call from my tech a few hours later hoping for the best but expecting the worst. It was...
...a bad catalytic converter. Whew. It was very hard to discern where the noise was coming from being the cat is right in front of the oil pan. Even my tech who is a seasoned 996 specialist had to drill a hole in the cat and stick a rod inside to put pressure on the element (the rattle then stopped) to confirm it was indeed the cat and not a lower end rod bearing or similar.
Here's to hoping it's a simple, cheap remedy....
I got a call from my tech a few hours later hoping for the best but expecting the worst. It was...
...a bad catalytic converter. Whew. It was very hard to discern where the noise was coming from being the cat is right in front of the oil pan. Even my tech who is a seasoned 996 specialist had to drill a hole in the cat and stick a rod inside to put pressure on the element (the rattle then stopped) to confirm it was indeed the cat and not a lower end rod bearing or similar.
Here's to hoping it's a simple, cheap remedy....
Thread Starter
Former Vendor
Joined: Oct 2014
Posts: 73
Likes: 0
From: Hudson OH
Thanks for everybody's kind thoughts and comments.
I got some good news. We drained the oil and removed the engine pan (really a bottom plate). No sign whatever of problems. Plate was clean and clear. The visible moving parts looked really good. Nothing to worry about.
Today the oil and filter will be replaced and the engine started with stethoscope in hand. Wish me luck.
Hope its the broken catalytic converter problem suffered by Spinout.
I got some good news. We drained the oil and removed the engine pan (really a bottom plate). No sign whatever of problems. Plate was clean and clear. The visible moving parts looked really good. Nothing to worry about.
Today the oil and filter will be replaced and the engine started with stethoscope in hand. Wish me luck.
Hope its the broken catalytic converter problem suffered by Spinout.
Thread Starter
Former Vendor
Joined: Oct 2014
Posts: 73
Likes: 0
From: Hudson OH
Feeling much much better now. Wondering just what was the fuss.
Stethoscope confirms no noises from engine and it is likely a noisy serpentine pulley. Much relief, smiling. Should get car back early next week.
Thanks everybody.
Stethoscope confirms no noises from engine and it is likely a noisy serpentine pulley. Much relief, smiling. Should get car back early next week.
Thanks everybody.
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Drifting
Joined: Apr 2014
Posts: 2,337
Likes: 28
From: Los Angeles
Because of the age , a "while you are in there" list may be useful ?
1 Belt.
2.The two idler and the tensioner pulley bearings may be getting noisy? You can in theory replace just the bearings if you have the equipment.Probably need a 10t press.Be careful using a 20t -easy to split/bend/distort the steel pulley. I upgraded to n.o.s. SKF bearings "Made in USA". Timken is =.
Soak the bearing+pulley in penetrating fluid overnight before using a press to push the old bearings out. Clean off all p/fluid from pulley. Freezer overnight for the new bearings.Use a smear of blue Loctite or green as a 'lubricant' to help the new bearing slide in without distorting the pulley. I paid about the same for a premium quality SKF bearing as for an OEM pulley with a generic bearing. If you are concerned about the quality of the bearing ,be careful to avoid Indian ,Chinese and other unreliable sources -even if they claim it is "SKF".Just my 2c.
1 Belt.
2.The two idler and the tensioner pulley bearings may be getting noisy? You can in theory replace just the bearings if you have the equipment.Probably need a 10t press.Be careful using a 20t -easy to split/bend/distort the steel pulley. I upgraded to n.o.s. SKF bearings "Made in USA". Timken is =.
Soak the bearing+pulley in penetrating fluid overnight before using a press to push the old bearings out. Clean off all p/fluid from pulley. Freezer overnight for the new bearings.Use a smear of blue Loctite or green as a 'lubricant' to help the new bearing slide in without distorting the pulley. I paid about the same for a premium quality SKF bearing as for an OEM pulley with a generic bearing. If you are concerned about the quality of the bearing ,be careful to avoid Indian ,Chinese and other unreliable sources -even if they claim it is "SKF".Just my 2c.